Crushing or pulverizing mill.



PATENTED FEB. '7, 1905.

E. G. GRIFFIN.

GRUSHING OR PULVERIZING MILL.

APPLICATION FILED MAR. 10, 1897.

3 SHEETS-SHEET 1.

minesses:

PATENTED FEB. .7, 1905.

E. 0. GRIFFIN.

GRUSHING 0R PULVERIZING MILL.

APPLICATION FILED MAR.10,1897.

3 SHEETSSHEET 2.

"'IIIIII;IIII I mm: ,Z rwenior:

,Edwc'n C. Grii tin,

No. 782,196. PATBNTED FEB. 7. 1905. B. c. GRIFFIN.

GRUSHING 0R PULVERIZING MILL.

APPLICATION FILED MAR. 10, 1897.

3 SHEETSSHEET 3.

No. 782,196. Patented February 7, 1905.

UNITED STATES PATENT EEIcE.

EDWIN O. GRIFFIN, OF W EST NEW'TON, MASSACHUSETTS, ASSIGNOR TO PETER B. BRADLEY, OF BROOKLINE, MASSAOHUSE TS, ANI) ROBERT S. BRADLEY, OF BOSTON, MASSACHUSETTS.

CRUSHING OR PULVERIZING MILL.

SPECIFICATION forming part of Letters Patent No. 782,196, dated February '7, 1905.

Application filed March 10, 1897 Serial No. 626,706-

.l'o (6 ZU/LO'HI/ it may (JOIMVN'IL: mounted on a rigid bed or base B, having a Be it known that I, EDWIN O. GRIFFIN, a subtrough-like depressed portion B, in which the ject of the Queen of Great Britain, residingat die rotates, said part having a wear-plate or 5 \Vest Newton, county of Middlesex, State of lining B (See Figs. 2 and 3.) At one end of 5 Massachusetts, haveinventcd an Improvement the base B I have shown two upright standin Crushing and Pulverizing Mills, of which ards O O, preferably of cast-iron, as they are the following description, in connection with compression members, and bolted at 2 to the the accompanyingdrawings, is a specification, base, each of said standards having at its upper 55 like characters on the drawings representing end an outwardly-cxtended hollow boss 0, inlike parts. ternally shouldered at e Fig. a. Roll-sup- This invention relates to that type of mill ports, shown as heavy, short, or stub shafts in which the material is crushed or pulverized c, Fig. I, having each an annular llange or by means of an annular die rotatable in a sub shoulder a, are mounted in the bosses, the 60 tantially vertical plane and supported by one flange 0 resting aga nst the shoulder 0* of the or more rotatable crushing-rolls having tanboss, as clearly shown in Fig. at, the supportgential contact with the inner circular face of ing portion c of the shaft being eccentric to the die. the main portion 0' beyond the flange 0 The The die-supporting roll or rolls will be end of the stub-shaft c projecting beyond its 5 mounted in fixed position, the die being held supporting boss has rigidly secured to it a 2 in contact therewith and pressing thereupon collar (5, preventing end motion of the shaft,

by gravity alone or by gravity in connection said collar having a series of radial holes v with spring-pressure, in contradistinction to therei y w i it y b0 POBiLtBd by e inmills wherein the dieisstationary and the rolls troduction of a bar to thereby vary the posi- 7 I v are revolved around and upon the die. tion of the supporting portion 0 and adjust Various novel features of my invention will the roll R supported thereon.

be hereinafter describe l, and particularly Ihave hereinshown two crushing-rolls R R,

pointed out in the following claims. each mounted on one of the supports c, the

Figure I, in side elevation, represents a roll-hub r forming a closed boss 1'' at the end 75 crushing and pulverizing mill embodying my within the mill, the opposite end of the hub 3 invention. Fig. 2 is a cross-sectional view flaring, as at 1' A bushing 1" maybe inthereof, taken on the line .1' .1, Fig. .1, looking sorted in the hub and in the closed end of the toward the right. Fig. 3 is a vertical sechub (see Fig. l) to take up wear, the support tional view of the mill on the line 41: TU, Fig. 0 entering the hub of and supporting the roll. Fig. L is an enlarged sectional view of which latter may otherwise be of any desired one of the supporting-rolls and its mounting, construction, herein shown as having a septhe adjustable journal therefor being shown arable tire 1", held in place by a retainingin elevation. Fig. 5 is a detail, detached and ring r and bolts 3. The roll can move laterin elevation, of the shield forasupporting-roll. ally upon its support (1, as will be obvious 5 Fig. 6 is a transverse sectional view taken on from an inspection of Fig. at, toward or away 4 the horizontal diameter of the die and looking from the flange and the roll is maintained up, showing the rolls and their supports in upon the support in a manner to be described elevation to indicate more clearly the relative hereinafter. A casting shaped to form a position of the die and supporting-roll axes, trough c and having acircular-opening in its 9 the angle between such axes, however, being end wall c to receive the hub is secured to 45 greatly exaggerated; and Fig. 7 is a diagram the inner face of the standard U, and a coverto be hereinafter described. plate c is detachably secured to said wall by Referring to Figs. 1 and 9 the apparatus is clips c, Fig. 5, the roll-hub extending through a hole in the cover-plate, such construction tending to keep dust and dirt away from the stub-shaft and the roll-hub.

To facilitate lubrication of the roll-hubs, the stub-shaft and supporting portion 0 may have a longitudinal duct 0 therein to convey oil to the hub, the surplus escaping from the open end of the hub 1* into the trough c, from which it may be withdrawn by suitable means. (Not shown.)

The two rolls R are supported side by side, but not in contact, and they may be adjusted Vertically or horizontally by the eccentric supports therefor, as described, to take up wear, &c.

An eyebar 0 fits over the ends of the shafts 0 outside of the collars 0*, connecting and guarding said shafts from lateral displacement, the bar having a boss 0 to receive a bolt 0, connecting said eyebar rigidly to the bed B. It will be understood that by means of the bolt 0 the frictional pressure upon the shafts exerted thereupon by or through the eyebar 0 can be increased to such an extent that the shafts will be held securely in place, the shafts being supported in the 'bosses of the casting (J. The eyebar and bolt thus act as a clamp to hold the shafts c in adjusted position, and they also form a tension member of the mill-frame, transferring part of the strain from the ends of the shafts to the bed or base B.

An arm or standard A is rigidly secured to one end of the bed opposite the rolls R and at some distance therefrom, said standard having a socket-bearing A for a split collar A having a spherical portion A Fig. 2, to form a universal joint for a shaft D to which the collar is secured, a ring 10 on the shaft preventing longitudinal movement in the bearing. The hub P of a pulley P is rigidly secured to the shaft adjacent the bearing, the pulley'being preferably concaved, so that its rim embraces or contains within it the universal bearing, the central plane of the pulley passing through the center of the hearing.

A ring D, herein shown as provided with an internal annular lining D, forms an annular crushing-die, which is supported by and has internal contact with the rolls R and upon which the die rotates. It will be obvious that if positive rotation is imparted to the rolls the die will be rotated by rolling frictional contact therewith, and vice versa, and I have herein shown the motive power as applied to the die. The die proper, D, is preferably removable to be replaced when worn, and the ring D has formed integral therewith at one side an annularinturned flange (Z, while at its, other side a separate ring cl, having an inturned annular flange (Z is securedby bolts 6 passing through ring D, the retaining-ring (5 thus serving to hold the die D in place. A number of arms (Z are secured to or formed integral with the ring D, said arms being shownas curved and extended radially to a central nave or hub (P, which is rigidly secured to the free end of the shaft D all as clearly shown in Fig. 2, whereby rotation of the shaft will rotate the annular die upon its supporting-rolls R. As will be referred to hereinafter, the roll-supports c are slightly inclined toward the longitudinal center of the shaft D to prevent by the cooperation of the die undue lateral movement of said rolls toward the left, Fig. 2.

A shield-plate or housingF is permanently attached to the frusto-conical part B of the base, surrounding and inclosing the rolls and die at the back of the mill, the plate having an opening F,'through which the die-shaft D extends. On the front of the mill, however. the housing is made in sections H, H, and H the latter being secured to the upturned parts B of the bed and to the standards 0 by bolts 8, (see Fig. 1,) while the section H is secured to the wall 0 of the trough-casting 0 and to a hood K, forming part of the outlet for the discharge of the pulverized material. The hood K is located above the center of the mill, as shown in Figs. 1 and 2, the hood being bolted to the parts B of the bed and to the cover-plate H, and the direction of the hood is substantially tangent to the periphcry of the die-ring D. A separating-chamber M of suitable shape, herein shown as a long rectangular box, is bolted to the hood, the chamber containing longitudinally-extended screens S S, one above the other, the upper one being the coarser, while the lower screen is attached to an abutment m, extended transversely across the chamber. The chamber is thus divided into three superposed parts 712, m and m, the first two opening into the hood K, while the lower one is closed by the abutmentm. An outlet-trough m leads from the compartment m outside of the mill to convey the properly crushed or pulverized material to the delivery-point. At thelower end of compartment 221 a spout k in the hood opens into the mouth of a conduit is within the sectional housing-plate H, the lower end of the conduit opening onto a concaved apron 71:", secured to the inner side of the casting C and forming a continuation of the feedchute C. Referring to Figs. 2 and 3, the apron is shown as leading to the inner circumference of the die D to convey the material thereto from the feed-chute U and also from the con duit k.

On the periphery of the ring D are secured a number of transverse blades or carriers (Z which run within the lining B of the millhousing, said lining being shown as sectional in Fig. 3 for convenience in replacing.

The rolls B may have plain cylindrical surfaces or they may be roughened or channeled in various ways, and in Fig. 2 the roll-surface is channeled to form a double helix similar to a double helical gear-face, so that a portion of the roll-surface will at all times be in contact with the the D, but not as a continuous surface.

Referring now to Fig. 6, it will be seen that the axes of the rolls R are substantially in parallelism; but they are slightly inclined to the axis of rotation of the die, and said axes of rolls R are substantially in a horizontal plane. Such arrangement of the several axes is for the purpose of causing the rolls to crowd or work laterally by rotation of the die, and thus be retained on their supports without providing special mechanism forsuch purpose, while the feature of lateral movement of the rolls is preserved.

If desired, the pressure of the die I) on the rolls B may be increased in any desired manner, and in Fig. 2 I have shown a springcontrolled device for the purpose, consisting of a spring S interposed between a washer uand a concaved plate )2, resting on the dieactuating shaft D the spring surroundinga link a, on which the washer is held by a nut a said link being securely held at its lower end to the base of the mill. Q

It should be noted that in Fig. 6 the angle between the axes of roll and die has been exaggerated .in order to show the angle, for in actual practice the rate of separation between the axes of the die and a roll-shaft is onesixteenth of an inch in one feet. This exaggeration of the angle between the axes also unduly distorts the roll-supports and shows the supports C U in cross-section as if they were in two quite different vertical planes, whereas the said supports are substantially in alinement with each other. The dottedline positions of the rollsRR show the lateral movement of the rolls on their supports 0 The operation of the mill is as follows: Power from any suitable source is applied by a belt to the pulley I, and through the shaft I) the die I) is positively rotated, the weight of the latter pressing upon and rotating the rolls R by friction. The material to betreated is fed into the chute C and the apron K distributes it upon the inner circumference of the rotating die, the material being held thereon by friction and centrifugal force, and it is carried up between the die and the rolls. It acted upon betweenthe die and one roll and then between the die and the other roll to be crushed and pulverized, the finer particles being squeezed or spread out laterally and falling to the bottom of the chamber-over the annular flanges (Z and (Z The accumulated crushed material in the trough B of the base is picked up around the exterior of the ring D by the blades or carriers (Z and finally discharged through the hood K into the separator M onto the coarse screen S, the particles small enough passing through the screen S into the closed compartment m and being discharged through the discharge trough or pipe n/ enough to pass through the screens rolls down to the spout K: into the conduit l" and onto the apron l, passing thenceback again to the die to be further treated.

By using channeled rolls some classes of material may be more thoroughly acted upon than by using smooth-surfaced rolls and the finer material is more quickly discharged. Channeled rolls also tend to spread out and more evenly distribute the material over the surface of the die.

Instead of the particular separator and screening device herein shown I may attach any suitable air or other separator to the hood at the discharge end thereof.

By bringing the center of the universal bearing of the die-shaft D in thecentral plane of the pulley P the irregular movement of the die caused by passing over the material to be crushed will not be communicated to the pulley with suflicient amplitude to interfere with the proper operation of the driving-belt.

A peculiar advantage is gained by running the die around and upon two rolls instead of one, as it is possible to thereby not only guide the die and prevent it from swinging in its plane of rotation, but also to get double the effective work from a die of a given weight in addition to the advantage of a much steadier running mill.

Referring to the diagram Fig. 7, it will be obvious that if a the D is hung upon one roll, as R (see dotted lines,) the die will press upon it with a pressure equal to the weight of the die in a vertical plane passing through their centers ti It is also obvious that if the die hangs upon two rolls R R whose axes or centers 11* 11" are in the same horizontal plane the pressure upon each roll will be equal and that as the angle decreases the pressure increases. This angle is that included between a horizontal line passing through the center of the ring and the radius of the ring which passes through the centerp of the roll. \Vhen equals zero, the pressure is infinitely great, and when P equals ninety degrees, or the two rolls are merged into one, it is equal to the weight of the die, and it can be shown by a diagram of forces that when equals thirty degrees the pressure upon each roll R is equal to the weight of the die. I have found by experiment that this angle will allow the die to rise freely from the rolls when material is introduced therebetween, and I prefer such angle or one deviating but slightly therefrom as the suitable angle to maintain. For some purposes and with some kinds of material it may be found desirable to somewhat vary the angle. I am enabled to maintain the desired angle by the adjustment provided for the roll -journals herein described, as the rolls and die wear when in use. The die may be made as heavy as is necessary to perform the required work.

Such material as is not fine 1 The rotatable ring or die is bodily movable about a fixed point located in its axis of rotation and outside the ring, as will be manifest from an inspection of Fig. 2, owing to the manner in which the shaft D is mounted in the socket-bearing A.

lWly invention is not restricted to the precise construction and arrangement herein shown and described, as the same may be varied Without departing from the spirit and scope of my invention.

Having described my invention, what I claim, and desire to secure by Letters Patent,

1. In a pulverizing-mill, a rotatable ring or die, two crushing-rolls rotatably mounted on fixed axes within said ring and upon which rolls the ring or die is rotatably supported, and means to positively impart to the ring or die a speed sufiicient to cause the material to be held against the inner surface of the said ring or die by centrifugal force, substantially as described.

2. In a pulverizing-mill, a supporting crushing-roll rotatably mounted on a fixed axis, an annular die surrounding and sustained by the roll, to permit free transverse movement of the die in a vertical plane, a secondary support for the die, and an actuating-shaft for and connected with thedie in alinement with its axis, substantially as described.

3. In a pulverizing-mill, an annular die, an actuating-shaft connected therewith in line with its axis, a rotatable crushing-roll within and forming a support for said die, a secondary support for the latter, and a single universal bearing for the die-actuating shaft, substantially as described.

a. In a pulveriziug-mill, an annular die, an actuating-shaft connected therewith in line with its axis, a rotatable crushing-roll within and forming a support for said die, a secondary support for the latter, a universal bearing for the shaft, and a pulley fast on the shaft, the pulley-rim surrounding the bearing, substantially as described.

5. In a pulveriZing-mill, a rotatable annular die, a crushing-roll within the die and forming a support for the latter, a secondary support for the die, means to positively rotate the die, and a stationary support for and upon which the roll rotates, said stationarysupport being inclined relatively to the axis of the die and providing a stop against which the closed end of the roll-hub is pressed, substantially as described.

6. In a pulverizing-mill, an annular rotatable die and crushing-rolls within the die each rotatably mounted on a fixed support and capable of lateral movement upon the support, the die rotating around, and being supported by, said rolls, the axes of the die and rolls being inclined relatively to each other, thereby causing side slip of the rolls upon the die to retain the rolls in proper lateral position, substantially as described.

7. Inacrushing and pulverizing mill, abase,

a standard thereupon, two shafts thereinhaving each an eccentric bearing-stud, a rotatable ring or die, two rolls within it, mounted to revolve upon the eccentric studs, and a link connecting the outer ends of said shafts, whereby they may be clamped in position, substantially as described.

8. In acrushing and pulverizing mill, an annular rotatable ring or die,.rolls within said die and upon which it travels, a crushing or pulverizing chamber in which the die rotates, and a series of lifting-blades on the periphery of the die, to carry the treated material up and out of the chamber, substantially as described.

9. In acrushing and pulverizing mill, an annular rotatable ring or die, rolls within said die and upon which it travels, a crushing or pulverizing chamber, in which the die rotates, a separator communicating with the outlet of the chamber, and a series of blades on the periphery of the die, to carry the treated material up and discharge it through the outlet into the separator, substantially as described.

10. In a crushing and pulverizing mill, an annular rotatable ring or die, rolls within said die and upon which it travels, a crushing or pulverizing chamber, in which the die rotates, a separator communicating with the outlet of the chamber, a screen-plate therein to receive the material, a return-conduit to convey the coarse material back to the chamber, a discharge-outlet for the separator, and means to introduce the treated material to the separator, substantially as described.

11. In a crushing and pulverizing mill, an annular die rotatable in a substantially vertical plane, two die-supporting rolls rotatably mounted upon fixed axes, within the die and in contact therewith, a chamber inclosing the die, an inlet to deposit material upon the inner circumference of the die, and blades upon the periphery of the die to take up and discharge the treated material through the cham ber-outlet, substantially as described.

12. In an apparatus of the class described, an annular rotatable die, two crushing-rolls capable of lateral movement upon their supports and having their axes of rotation inclined relatively to the axis of the die, the die being supported upon and surrounding the rolls, and means to rotate the die and rolls in a direction to crowd the rolls toward their supports.

13. In an apparatus of the class described, a rotatable ring forming a die, and rolls projecting into the ring from one side thereof and providing its sole vertical support, and cooperating therewith to effect the crushing, and means to permit bodily movement of the ring about a fixed point located in its axis of rotation and outside the ring.

14. In an apparatus of the class described, an annular rotatable die open on one side, a crushing-rollmounted on a fixed support and projecting into the open side of and forming TIO a support for the die, said roll being capable of lateral movement upon its support, the axes of the die and roll being inclined relativelp to each other, thereby causing side slip of the roll upon the die to retain the former in proper lateral position and a secondary support for the die.

l5. In an apparatus of the class described, an annular rotatable die open on one side, a shaft connected with the other side thereof and having a universal bearing in the axis of rotation of the die and a roll projecting into 

